Thermostatic device



E. B. LENNIG.

THERMOSTATIC DEVICE.

APPLICATION FILED JUNE 26,1917.

1,.391,329.fA Patentedsept. 20,1921.

y? LJJ ATTORNEYS E. B. LENNIG.

THERMOSTATIC DEVICE. APPLlcATloN F\LED1uNe26,1917.

1,891,829. PatentedSept. 20, 1921.

2 SHEETS-SHEET 2.

P @will E mmnnnnmm. m :@nnunnm INVENTOR ATTORNEYS BYMM 'UNITED vs1-Arss* PATENT oFFlcE.

EDI'UND B. LENNIG, SAN FRANCISCO, CALIFORNIA, AS-SIIIGINTOR, T0 THE'MICENGINEERING C O., OF SAN FRANCISCO;

CALU'ORNIA.

, mostatic device for controlling electrical and other devices includedin circuit .or in communication with said thermostatic device, togetherwith novel means for adjust! ing said thermostatic device toautomatically control said electrical devices according to the degree oftemperature to which said thermostatic device is adjusted.

One object of my invention is to provide a novel thermostatic deviceconsisting of a plurality of thermostats and a plurality of switches orcontact members Vso arranged in relation to each other and provided withmeans to allow for varying temperature adjustment between saidthermostats and switches to automatically control the.elec' tricaldevices in electrical and .thermal connection with the switches of saidthermostat.

A further object of my invention is to provide a novel thermostaticdevice consisting of amovable switch provided with an adjustable devicelocated intermediate the pivot and contact portion of the said switch,said adjusting device being'- adapted to be actuated by the free end ofthe thermostat blade to afford a multiplied movement tothe switch at itscontact'portion in respect to a contact inthe circuit, so as to insure.positive making and' breaking of the electric circuit to preventsparking and fusing in the thermostatic device.

A further object oi" my invention is to provide a` novel thermostaticdevice, wherein the time difference in the expansion and con traction ofthe thermostat in respect'A tothe switch operated by the thermostatblade is equalized through the medium of a counterbalance weight forminga part of the switch and located out of the center of gravity of thepivot of said switch to normal y-include the switch in circuit with theelectric device.

' Al further objectl of -my invention is `to provide a novelthermostatic device opera-F tive `under various thermal conditions, suchas atmospheric'and liquid, together with a construction readilyadjustable for existin conditions, with a novel arrangement anSpecification of Letters Patent.

CALIFORNIA, A comen-Arron or i 'mnmros'ra'rm Dnvrcn i Patented Sept. 20,1921.

Application filed-June 26, 1917. Serial No. 177,084.

collocation of the various parts, that cannot be displaced in handling,provision ,being made to prevent short circuiting, sparkin and fusing,together with the elimination o false temperature in thethermostatblades, which can be readily installed, and willi be eilicientin operation in connection with various electrical and otherv devices tominimize the supply of electric current necessary for the operationthereof. f c

` A still further' object of my invention is to provide a novelthermostatic device adapted for use in connection with electric or otherdevices, means being provided in connection with said thermostat andelec-J trical devices to bring the electrical device to its requiredcapacity, by simultaneously utilizing all the heating units of saidvelectrical device controlled by the temperature adjusted switches ofthe thermostatic device, and means being further provided Jforautomatically cutting out the excessive electric current from theminimum. temperature when the re uired capacity of the electric deviceis reac ed to minimize the time necessary and the electric supply tohold the electrical device to its required capacity. To the above endsmy invention in its broad aspects consists of a novel construction of alswitch or Contact member and a novel collocation of a plurality of suchswitches or contact members, each of said switches having a laterallyextending arm and a counterbalance located thereunder, so as to causethe automatic depressions of said arms to close an electric circuit,said arms being provided with adjusting screws coacting with thermostatblades in a novelV manner. n For the purpose of illustra-ting myinvention, yI have shown in the accompanying drawings certain vformsthereof which are lat present preferred by me, since the same will be,found in practice to give satisfactory and reliable results', `althoughit is to be understood that the various instrumentalities of which myinvention consists can be variously arranged and organized and that myinvention is not limited to the precise arrangement and organization ofthese instrumentalties as herein shown and.i described. v

Figure 1 rep mostatic device, my invention. l

Fig. 2 represents a section on the line 2 2 of Fig. 1.

Fig. 3 represents a perspective view of one of the switches or contactmembers.

4ig. 4 represents a section on line 4 4 Fig. l.

Fig. 5 represents a section on line 5-5 Fig. 1, showing a plurality ofswitches or contact members with different adjustments in respect to aplurality of thermostatic metallic strips. F Fig 6 represents a frontelevation of Fig. 7 represents a diagrammatic View, illustrating theelectric wiring and connections of the device when used in conjunctionwith an electric heater or similar appliance. Similar numerals ofreference indicate corresponding parts in the ligures.

eferring to the Adrawings l 1 designates a base composed of insulatingmaterial u on which is mounted my novel thermostatlc device, consistingof a plurall ity of thermostat blades 2, adapted to actuate a plurality'of switches or contact.

membersl 3, according to varying degrees of temperature to controlelectrical devices included in the circuits with/Athe thermostaticevice.

t dlsignates a bus bar securedto the base 1 t binding post 6inconnection withany suitable source of electrical energy.

6x designates extensions or uprights forming a part of the bus bar 4, inwhich is positioned the shaft 7 to afford a mounting, for the movableswitches or contact members. 3, ghose construction will be understoodfrom 'he contact members 3 consist of the outwardly or laterallyextendingcontact arms to thedownwardly and outwardly depending ordiverging arms 9, which carry the counterbalance weights 10, which .arelocated past the center of gravity of the pivot of said contact membersto hold said contact arms 8 thereof normally in contact Awith thecontact posts 11 `in'electrical connection with the electrical devicesto be controlled by the thermostat, as hereafter fully de scribed. f

The shaft 7 acts as a conductor of electricity between the contactmembers 3 and the bus bar 4. 12 designates insulating washers locatedbetween the extensionsX of the bus bar 4 and the contact members 3 toprevent sparking and=fusing. t

13 designates a block of insulating material carried by or forming apart of the base 1, and to which the thermostat blades- 2 are secured bythe screws 14, said thermo- .stat blades extending inwardlyV past'thepivot'point of the contact member 3 and `under the contact arms 8.

e screws 5, and also provided with the 15 designates adjustable devices,prefere ably screws, provided with lock nuts, arranged in the contactmembers 3 and adapted to be adjusted to various positions in. relationto the thermostat blades 2 to cause said thermostat blades 2 when eX-panded or contracted to actuate the contact members 3 according to thevarying degrees of temperature to which said thermostatic blades 2 aresubjected. With the arran ement of devices between the thermostat b ades2 and the contact members 3 as above described, the point of actuationof the contact members 3 by said thermostat blades 2 is locatedintermediate the pivotal portion of saidcontact members 3, wherebyf'amultiplied movement is obtained between the contact portion of thecontact members 3 and the contacts 11 to assure a positive and'efectivemaking and breaking of the electric circuits 17 to prevent sparking andfusing.-

To compensate'for the difference in the expansion and contraction of thethermostat blade 2, and to equalize the same action in respect to thecontact member 3, the counter- Weights 10 of the-contact member 3 areprovided and located at the proper point beyond the center of gravity ofthe contact member 3, as above explained.

In this device, the thermostat blades 2 are not included in the circuits17, thereby eliminating false heat in the action of the thermostatblades.

Referring now to Fig. 7 of the drawings, an electric. Wiring diagram isshown, illustrating one use of'my invention in connection with an.electric heating appliance, consisting of a plurality of heating coils16 and a plurality of'switches 3, which it will be 4understood are onthe opposite side of the 8 preferably formed lntegral with or secured base 1, seen in Fig. 7, thermostaticallycontrolled included in theelectric circuits 17 independent of each other` and in circuitr with themain service circuit 17x for controlling the energizing andde'e'nergizing of said heating Vcoils 16 either independent of eachother or collectively.

The switch 18 is provided in the main service circuit 17 forstarting'the device to include all the circuit.

It will' of course be understood that with" a reversal of the thermostatblades 2 and aslight readjustment of the ad'usting means l5 of thecontact members 3 t e device may be; operative with electrical 'deviceswhere cold temperatures are employed. y

The operation is 'as follows e It will be understood that my novelthermostatic device2 is adapted for use in connection with variouselectrical or other devices, but for convenience of description andillustration, I have illustrated in Fig. 7 anfelectric heating deviceconsisting oft the' eating coils 16 in electric .corresponding heatingcoils heating coils 1d included in the circuits 1-7 ot the thermostaticdevice.

. Referring to Fig, 5 of the drawings,the adjustable means or screw 15of the switches or contact members 3 are adjusted in relation to thethermostat blades 2 to be operated thereby in the expansion. andcontraction thereof, according to the varying degrees oi temperature towhich said thermostat blades are subjected.

Assuming the desired temperature tobe produced is 190 at maximum, theadjusting screws 15 carried by the arms 8 of the various contact members3 will be set in operation at diiierentprogressive temperatureadjustments between a minimum temperature at 175 and the maximumtemperature oi 190, as will be noted from the position oi the adjustingscrews 15, seen in Fig. 5, reading trom right to left. lin starting thedevice the switch 18 is closed and the electric circuits are completedto simultaneously energize all the heating coils 16 until thetemperature in the electrical device gradually rises to successively andautomatically cut out the switches 16 from the minimum temperature untilthe device reaches its maximum tempgrature at which time the lelectricaldevice/is to be' held at suoli temperature by one or more heating coilssupported by the intermittent energizing and denergizing of thepreceding heat ing coils due to an intermittent action o'- acorresponding tliermostatic switch caused by a falling or rising in thetemperature oi the electrical device when heated to thel substantialmaximum temperature.

l desire to call especial vattention to th`e construction and manner ofmounting oi the switch or contact member 3, seen in Fig. 3, comprisingthe laterally extending arm 8 and the downwardly diverging ing thecounterbalance 10 located of the pivotal Support, or,

at one side in other words, [of said By vthis construction, when theparts' are assembled, it will be apparent that the arm. or arms 8 alwaysare automatically depres'sd bygravity so as to rest on the contactpost-s, 11 and tend to close the' circuit between the members 8 and 11,said circuit being bro-lien or opened when the expansion of the blade orblades 2 occurs to a suiiicient extent to leiect a contact with andelevate the adjusting screw 15 and the arm 8 carrying the Same. C

1 It will now be'- apparent'that 'l have de.

`vised a novel and useful thermostatic device,

y which `embodies the features ofadvantage enumerated as described inthe statement 2oi the invention and the above description,

`and whileo have, in the present instance,

shown and described typical ,embodiments 3 controlling arms 9, havnarmout of contact with said bindinlp.

of it which will give in practice satisfactory vand reliable results, itis to be understood that these embodiments are susceptible ofmodification in various particulars without departing from the spirit orscope of the invention or sacrificing any of its advantages.

Having thus described my invention, what l claim as new'and desire tosecure by Letters Patent, is

1; ln a thermostat able screw projecting through said arm, acounterbalance carried by said arm, below the latter and at one side ofits center of out of contact with said contact post,

2. A thermostaat device comprising a device, 'a pivoted switch `having alaterally extending arm, an adjustswitch, having a laterally extendingarm,

inclined arms depending downwardly there from, a counterbalance carriedby said depending arms and located under said lateral arm toautomatically depress said lateral arm, an adjustable vscrew in saidlaterally' extending arm, a binding post with which said laterallyextending arm normally conf taete, and a. thermostat blade extendingthrough said depending arms and located above said* counterbalance andcoperating with .the lower end of said screw to eilect the opening oithe circuit by moving said lat/er ally extending arm away ost.

ported above said blade and in prexnnnzyy therewith, said switch havinga laterally extending arm, an adjusting screw passing throu h said armand engaged by the top ci4 adjusting screw passing through said arm,-and a counterbalance `positioned below saidA arm outside of the centerof gravity oiE said arm, a binding post on which said arm normallyrests, anda thermostat blade located above said counterbalance andadapted to engage said adjusting screwv to move said EDMUND B. LE

Witnesses.: c

E. HAYWARD' FAmeANxs,

C. D.-MoVar.

3. A thermostat device comprising a ther-- mostat blade and a switchpivotallywsup=-l from said binding ofthe. i I

Aiit

isc

